Continuous micro-reaction device and method for preparing meta-aramid resin and product

Abstract

A continuous micro-reaction device for preparing meta-aramid resin comprises a prepolymerization system, a polycondensation system, an after-treatment system and a heat exchange system, wherein the prepolymerization system, the polycondensation system and the after-treatment system are connected in sequence, and the heat exchange system is connected with the prepolymerization system and the polycondensation system to control temperatures of the prepolymerization system and the polycondensation system. The continuous micro-reaction device is characterized in that the prepolymerisation system comprises a raw material storage device, a micro-mixer and a micro-reactor which are connected in sequence; the polycondensation system comprises a multistage micro-screw device, and the micro-reactor is connected with multistage micro-screw device. The continuous micro-reaction device for preparing the meta-aramid resin improves the heat transfer effect at the polycondensation stage and the mass transfer effect at the polycondensation stage during preparation of the meta-aramid resin, and achieves the purpose of improving the performance of a meta-aramid resin product. The invention further provides a continuous micro-reaction method for preparing the meta-aramid resin and the product.

Description

technical field [0001] The invention relates to a device for preparing meta-aramid resin, in particular to a continuous micro-reaction device for preparing meta-aramid resin, the invention also relates to a method and product for preparing meta-aramid resin, which belongs to the preparation of polymer materials technical field. Background technique [0002] Meta-aramid fiber is poly-m-phenylene isophthalamide fiber, which is called aramid 1313 in my country. Aramid 1313 is one of the fastest-growing varieties of high-performance fibers today, and it is a kind of fiber with excellent comprehensive performance. High-tech fibers can maintain about 80% of the original strength at 200 °C, and can still maintain about 70% of the original strength when used for 100 hours at 260 °C, and form a barrier between the human body and clothes, reducing heat transfer effect and providing protection effect. It can withstand the action of most acids and has good stability to alkalis. Due to...

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Problems solved by technology

But m-phenylenediamine is very easy to oxidize, so it is not suitable to mix with solvent in the pre-polymerization stage, and the DMAc solution of m-phenylenediamine and the molten isophthaloyl chloride are mixed in the No. 2 mixer and exothermic instantly, The exothermic heat of the reaction cannot be effectively transferred at the first time, and the high temperature at the moment of the reaction leads to the formation of small molecular by-products and low molecular weight polym-phenylene isophthalamide molecules, and the molecular weight distribution of the final polymer is poor; the continuous polymerization The method has a good mass transfer effect in the polymerization process, but it does not fundamentally solve the heat transfer problem at the initial stage of the reaction

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